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Physical properties investigation of Fe 1−x Al x (x ≤ 50%-at) alloys using DFT and Wagner-Schottky model

Abstract : Atomistic modeling based on the Density Functional Theory (DFT) is used to study the structural, magnetic, electronic and mechanical properties of Fe1−xAlx alloys (x ≤ 50%-at) with and without B, C and N additions over the selected range of Al atomic concentration. It is shown that a singularity around xAl ∼ 40%-at is observed for the lattice parameters while the magnetic moment decreases uniformly without unexpected trend. The enthalpies of formation indicate that the presence of B stabilizes the system for Al concentration in the range of 25%-at < xAl < 45%-at and the electronic properties are affected by B, C and N additions. The trends in Young modulus, bulk modulus, expected ductility (Pugh ratio) and Vickers hardness evolution are also estimated. N addition improves the Young modulus of alloy while C addition increases its ductility. By using the Wagner-Schottky model, temperature and composition dependences of thermal vacancies in B2-FeAl reveal that the double defect AlFe anti-sites and Fe vacancies are dominating in the Al-rich side at finite temperature. In addition, the diffusion phenomenon is observed for B, C and N atomic defects.
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https://hal.univ-lorraine.fr/hal-03601333
Contributor : Thierry Grosdidier Connect in order to contact the contributor
Submitted on : Tuesday, March 8, 2022 - 11:05:19 AM
Last modification on : Friday, March 18, 2022 - 4:30:55 PM

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I Berrached, M Gallouze, L Rouaiguia, L Rabahi, T Grosdidier, et al.. Physical properties investigation of Fe 1−x Al x (x ≤ 50%-at) alloys using DFT and Wagner-Schottky model. Physica Scripta, IOP Publishing, 2020, 95 (11), pp.115702. ⟨10.1088/1402-4896/abbde0⟩. ⟨hal-03601333⟩

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